单项选择题

The magician picked several persons ______ from the audience and asked them to help him with the performance.

A．by accident
B．on occasion
C．at random
D．on an average
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单项选择题
The company had huge debts and was on the ______ of collapse.
A．brink
B．blaze
C．braise
D．blink
单项选择题
A number of black youths have complained of being ______ by the police.
A．plagued
B．alienated
C．harassed
D．conspired
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